Priming mixture



Patented Oct. 3, 1933 PATENT OFFICE rnnumo MIXTURE James E. Burns, Bridgeport, Coma, assignor to Remington Arms Company, Inc., a corporation of Delaware No Drawing. Application May 26, 1931 Serial No. 540,196 1 11 Claim.

This invention relates to priming mixtures, particularly to priming mixtures of the noncorrosive type, and'contemplates the use of certain recently discovered salts aspriming mixture fuels. I

Ammunition priming mixtures as ordinarily made comprise three classes of ingredients: a fuel, or substance to be oxidized; an oxidizer, to furnish the oxygen necessary for the-oxidizing of the fuel; and, a combustion initiator, having the function of starting the reaction between the fuel and the oxidizer. It is not necessary that either the fuel or the oxidizer in themselves be subject to decomposition under the stimulus 5 of a blow. The combustion initiator, however, must be sensitive to shock, its decomposition being productive of sufficient heat and pressure to cause reaction between the oxidizer and fuel.

Present day conditions add the requirement that 3* no ingredient of the mixture leave a corrosive residue. This requirement greatly restricts the field of usable priming materials, and gives rise to peculiar problems. The available non-corrosive oxidizers are acidic in character, and

tend to produce an acidic condition in the mixture which may be detrimental to stability, in that it promotes a reaction between certain commonly used combusion initiators and a common fuel. A fuel which does not tend to react with the combustion initiator in the presence of weak acids is therefore most desirable.

The present invention comprises the discovery that certain recently found salts of a derivative of salicylic acid are excellent priming mix- 5 ture fuels and possess extraordinary stability characteristics. They are the salts of dinitrosalicylic acid, and particularly the lead salts thereof. These lead salts have been but recently discovered. The normal salt has the composition CBHflNOzMOCOOPb, and analysis of a basic salt which has been produced indicates its composition to be CeHa(NO2) :OPbOHCOOPbOH. while either of these salts constitutes a desirable priming mixture fuel, the normal salt is preferred. Desirable results have been secured by the use of this salt in conjunction with such combustion initiators as mercury fulminate; a mixture of mercury fulminate and lead styphnate; lead styphnate alone; mixtures of lead styphnate and guanylnitrosaminoguanyltetracene; basic lead picrate; basic lead picrate with guanylnitrosaminoguanyltetracene; diazodinitrophenol; di-

azodinitrophenol with basic lead picrate: and diazodinitrophenol with lead styphnate; and with such oxidizers as lead nitrate, basic lead nitrate,

and barium nitrate. Admixtures of other fuels, such as antimony sulphide and calcium silicide, are sometimes desirable.

A typical mixture utilizing mercury fulminate as a combustion initiator is as follows:

Mercury fulminate 40% Barium nitrate 29 Normal lead dinitrosalicylate 10 Glass 20 Gum 1 It is sometimes desirable to add to such mixtures varying amounts of lead styphnate. Such 7o mixtures are as follows:

preferably 25% Mercury fulminate 25% to 40% Lead styphnate 5 to 10 preferably 8 Barium nitrate 24 to 44 preferably 44, Antimony sulphide to 16 preferably 16 Normal lead dinitrosalicylate 4 to 10 preferably 7 Glass 0 to 30 Typical mixtures including basic lead picrate and diazodinitrophenol as combustion initiators so are as follows:

Calcium silicide 0 Mercury fulminate mixtures utilizing basic lead 9 dinitrosalicylate are as follows:

Murcury fulminate 35% to 40% Lead styphnate 0 to 5 Barium nitrate 24 to 30 Basic lead dinitrosalicylate 5 to 10 Glass 20 17030 A non-fulminate mixture utilizing basic lead dinitrosalicylate is Lead styphnate 30% Guanylnitrosaminoguanyltetracene 2 Basic lead nitrate 30 Basic lead dinitrosalicylate 13 Glass 7 25 All of the foregoing formulas, however, are

merely typical, and are to be understood as illustrative, and not restrictive, the invention being fundamental in character and limited only by a broad interpretation of the appended claims.

What is claimed is:

1. A priming mixture for ammunition containing .a lead salt of dinitrosalicylic acid.-

2. A priming mixture containing a normal lead salt of dinitrosalicylic acid.

3. A priming mixture for ammunition containing a basic lead salt of dinitrosalicylic acid.

4. A priming mixture containing a lead salt of dinitrosalicylic acid, a suitable combustion initiator, and a non-corrosive oxidizer. I

5. A priming mixture containing a lead salt of dinitrosalicylic acid, a non-fulminate combustion initiator, and a suitable non-corrosive oxidizer.

6. A priming mixture substantially as follows:

Glass 0- 7. A priming mixture containing substantially Mercury fulminate 25% Lead styn'hnate 8 Barium nitrate 44 Antimony sulphidp 16 Normal lead dinitrosalicylate '1 JAMES E. BURNS. 

